HOW DO FORMS OF
WATER CHANGE?
Lesson 2
Learning Goal: You will understand how water
changes form and apply what you know about
the water cycle.
Forms Water Can Have
• Cold weather can
freeze water from a
liquid to a solid.
• Warm temperatures in
the spring and summer
keep water in liquid
form.
• When water freezes it
takes up more space.
Evaporation
• Water can also become
a gas called water vapor.
• Evaporation is the process
of a liquid becoming a gas!
• The Sun’s energy
evaporates surface
water.
• That then becomes
water vapor in the air.
• You cannot see water
vapor but you can
sometimes feel it on a
hot day .
Condensation
• Water vapor in the air
can turn back into a
liquid!!
• The process of water vapor
changing to a liquid is
condensation!
• When the air cools,
condensation turns
invisible water vapor
back into drops of water.
• Small droplets form
clouds and fog.
• Large drops that form on
plants are dew.
The Water Cycle
• There is only a certain
amount of water on
Earth.
• It must be used again
and again.
• The movement of water
from Earth’s surface into
the air and back again is
the water cycle!
• Water changes form or
state as it moves
through the water cycle.
Precipitation
• When water particles in clouds grow in size and weight, they fall faster!
• Water that falls to Earth is called Precipitation!!
• The form of precipitation depends on the temperature at Earth’s surface.
The Water Cycle